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<div class="titlepage"><div><div><h3 class="title">
<a name="range.concepts.concept_checking"></a><a class="link" href="concept_checking.html" title="Concept Checking">Concept Checking</a>
</h3></div></div></div>
<p>
        Each of the range concepts has a corresponding concept checking class in
        the file <a href="../../../../../../boost/range/concepts.hpp" target="_top"><code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">range</span><span class="special">/</span><span class="identifier">concepts</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code></a>.
        These classes may be used in conjunction with the <a href="../../../../../../libs/concept_check/index.html" target="_top">Boost
        Concept Check library</a> to ensure that the type of a template parameter
        is compatible with a range concept. If not, a meaningful compile time error
        is generated. Checks are provided for the range concepts related to iterator
        traversal categories. For example, the following line checks that the type
        <code class="computeroutput"><span class="identifier">T</span></code> models the <a class="link" href="forward_range.html" title="Forward Range">Forward
        Range</a> concept.
      </p>
<p>
</p>
<pre class="programlisting"><span class="identifier">BOOST_CONCEPT_ASSERT</span><span class="special">((</span> <span class="identifier">ForwardRangeConcept</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;</span> <span class="special">));</span>
</pre>
<p>
      </p>
<p>
        An additional concept check is required for the value access property of
        the range based on the range's iterator type. For example to check for a
        ForwardReadableRange, the following code is required.
      </p>
<p>
</p>
<pre class="programlisting"><span class="identifier">BOOST_CONCEPT_ASSERT</span><span class="special">((</span> <span class="identifier">ForwardRangeConcept</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;</span> <span class="special">));</span>
<span class="identifier">BOOST_CONCEPT_ASSERT</span><span class="special">((</span> <span class="identifier">ReadableIteratorConcept</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">range_iterator</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">&gt;</span> <span class="special">));</span>
</pre>
<p>
      </p>
<p>
        The following range concept checking classes are provided.
      </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
            Class SinglePassRangeConcept checks for <a class="link" href="single_pass_range.html" title="Single Pass Range">Single
            Pass Range</a>
          </li>
<li class="listitem">
            Class ForwardRangeConcept checks for <a class="link" href="forward_range.html" title="Forward Range">Forward
            Range</a>
          </li>
<li class="listitem">
            Class BidirectionalRangeConcept checks for <a class="link" href="bidirectional_range.html" title="Bidirectional Range">Bidirectional
            Range</a>
          </li>
<li class="listitem">
            Class RandomAccessRangeConcept checks for <a class="link" href="random_access_range.html" title="Random Access Range">Random
            Access Range</a>
          </li>
</ul></div>
<h5>
<a name="range.concepts.concept_checking.h0"></a>
        <span class="phrase"><a name="range.concepts.concept_checking.see_also"></a></span><a class="link" href="concept_checking.html#range.concepts.concept_checking.see_also">See
        also</a>
      </h5>
<p>
        <a class="link" href="../style_guide.html" title="Terminology and style guidelines">Range Terminology and style guidelines</a>
      </p>
<p>
        <a href="../../../../../../libs/iterator/doc/iterator_concepts.html" target="_top">Iterator concepts</a>
      </p>
<p>
        <a href="../../../../../../libs/concept_check/index.html" target="_top">Boost Concept Check library</a>
      </p>
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<td align="right"><div class="copyright-footer">Copyright © 2003-2010 Thorsten Ottosen,
      Neil Groves<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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